/Engine/Plugins/Experimental/ModularGameplay/Source/ModularGameplay/Public/Components/GameFrameworkComponentManager.h
Sends an arbitrary extension event that can be listened for by other systems
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Gameplay", Meta=(DefaultToSelf="Receiver", AdvancedDisplay=1)) void SendExtensionEvent ( [AActor](API\Runtime\Engine\GameFramework\AActor) * Receiver, [FName](API\Runtime\Core\UObject\FName) EventName, bool bOnlyInGameWorlds )